Can the adenovirus vector vaccine accelerate vaccination?

A few days ago, according to the Beijing Municipal Center for Disease Control and Prevention, the new crown vaccine has gradually lifted the age limit for vaccination, and some elderly people aged 60 and above who have vaccination needs and have a good physical condition are vaccinated against new crown vaccine.

Previously, the new crown vaccination in various places was mainly aimed at people between the ages of 18 and 59.

Why was the vaccination age limited to 18 to 59 years old before?

Experts say that people who are too young and too old also have poor immunity and have more uncertain factors.

Wu Zunyou, chief epidemiologist of the Chinese Center for Disease Control and Prevention: People under the age of 18 have mild symptoms or a high proportion of asymptomatics after being infected with the new crown virus, so they are not the priority group for vaccination.

Can the adenovirus vector new crown vaccine promote the speed of vaccination?

my country's new crown vaccine research and development has always been at the forefront of the world, and there are currently four conditionally marketed new crown vaccines.

Zhu Tao, Vice President of China Vaccine Industry Association: The real large-scale use of our vaccines may take until May and June, because we will have more products to supply by then.

Wu Zunyou, chief expert of epidemiology at the Chinese Center for Disease Control and Prevention: Adenovirus vector vaccines and inactivated vaccines are no different for the population.

What is the "herd immunity barrier"? What are the conditions for the formation of the "immune barrier"?

The ultimate goal of vaccination is to form a herd immune barrier.

Wu Zunyou, chief epidemiology expert of the Chinese Center for Disease Control and Prevention: Calculated according to the spread coefficient of the new coronavirus, the formation of an immune barrier in the population generally requires about 70% to 80% of the population to be vaccinated.